Pumping jack



Nov. 15, 1927.

H. J. SMITH PUMPING JACK Filed Sept 2. 1926 2 Sheets-Sheet 1 0 h o .ilu||||||||||||JnJUJ\\1/, .lllll I... .ITIIMJI III j/ 4 T Hamil... L wu n in I L v Nov. 15, 1927. I 1,649,137

H. J. SMITH PUMPING JACK Filed Sept. 2. 1926 2 sham-Sheet 2 9 a: 46

I/V VE/V TOR. M/Bmr 1. S/W M pure it ncnnnr a. station, or LONG- BEACH, cnnrronnra.

PUMPING JACK.

Application filed September An object of my invention is to provide a pumping jack having a long stroke and which may be operated by the exertion of but little power.

Another object is to provide a pump jack in which the polish rod is not bent during the operation of the jack.

A further object is to provide a pumping jack of the character stated which may be readily removed when it is desired to work upon the well.

A still further object is to provide a pumping jack which is simple in construrtion and effective in operation.

Other objects, advantages and features of invention may appear from the accompanying drawing, the subjoined detailed description and the appended claims.

in the drawing:

Fig. 1 is a side elevation of my pumping jack.

Fig. 2 is an end view of the same.

Fig. 3 is a plan view of the pumping jack.

4 is a sectional view taken on line 1% Fig. 2.

Referring more particularly to the drawing:

My pumping jack comprises a pair of up right columns 1, 2 which are hinged as at 3 and a to the floor of the derrick 5 or other suitable structure. The columns 1, 2 are held in an upright position by suitable guy ropes 6, 6. It will be seen that the columns 1, 2 may readily be swung downwardly upon the hinges 3, l by releasing the guy ropes 6, 6 from their fastenings. lVhen in the lowered position the columns 1, 2 are supported on legs 7, 8, respectively, which legs are hinged to the columns and are swung outwardly when in use.

A cross head 9 is reciprocally mounted in grooves 10, 11 in the columns 1, 2 and the usual polish rod 12 is suitably secured in said cross head. A shaft 13 is journalled in bearings 14, 14 on the upright 1, 9., and a link 15 is secured to said shaft.

A pitman 16 is pivotally connected to the cross head 9, and a pin 17 pivotally connects the link 15 and pitman 16. The pitman 16 is formed with a recess 18 so that it will escape the shaft 13 when in the lowered position as shown in Fig. 1. By this construc tion I provide a more direct upward thrust on the cross head 9, and thus relieve said cross head of side strain.

An operating arm 19 is pivotally mounted 2,, 1926. Serial No. 133,119.

on the pin 1*? and said arm attends sub stantially the full height of the columns 1, 2 and an operating link 20 is pivotally connected to the upper end of said arm. This link is connected to a suitable source of power (not shown), which source of power is adapted to reciprocate the link.

In starting the operation of the jack with the arm 19 in the position shown in Fig.1, the arm is drawn downwardly by the link 20, and said arm bearing against the shaft 13 causes the link 15 and pitman 16 to swing upwardly to the position shown in solid lines, Fig. 4.. The arm 19 now engagesthe bar 21, which bar is secured to the columns 1, 2 adjacent. the lower end thereof. An inclined surface 22 is provided on the arm 19 to better engage the bar 21, and forms a fulcrum to swing the link 15 .over the horizontal position shown in solid lines, Fig. 4:. As soon as the link 15 swings over the hori-"- zontal position, a continued pull on the arm 19 causes said link to swing upwardly to the position shown in dotted lines, Fig. 1, thus moving the cross head 9 to its extreme upward position. The arm 19 is now moved rearwardly and upwardly to the starting position, shown in Fig. 1.

lVhen swinging the columns 1, 2 and attached appliances rearwardly so that the well may be worked upon, the bar 21 is either removed or swung to one side on a pivot. To limit the upward swing of the link 15, a stop lug 23 is provided on the lower end of the arm 19, which lug engages the shaft 13 as shown in dotted lines, Fig. 4.

Having described my invention 1 claim:

1. A pumping jack comprising a pair of upright columns, a cross head reciprocally mounted in said columns and adapted to be secured to a polish rod, a shaft, a link secured to said shaft, a pitman pivotally connected to said cross head, an operating arm, a pin extending through said arm, link and pitman, means to oscillate said arm, and means adapted to be engaged by said arm during its oscillation to act as a fulcrum, whereby the link is swung over the horizontal position.

2. A pumping jack comprising a pair of upright columns hinged to the floor, a cross head reciprocally mounted in said columns and adapted to be secured to a polish rod, a shaft, :1. link secured to said shaft, a pitman pivotally connected to said cross head, an operating arm, a pin extending through said arm, link and pitman, means to oscillate said arm, and a bar adapted to be engaged by said arm during its oscillation, said bar acting as a fulcrum, whereby the link is swung over the horizontal position.

3. A pumping jack'comprising a pair of upright columns hinged to the floor, a cross head reciprocally mounted in said columns and adapted to be secured to a polish rod, a shaft. a link secured tosaid shaft. a pitman pivotally connected to said cross head. said pitman having a recess therein adapted to accommodate the shaft, an operating arm, a pin extending through said arm. link and pitman and means to oscillate said arm.

4. A pumping jack comprising a pair of upright columns hinged to the floor. a cross head reciprocally mounted in said columns and adapted to be secured to a polish rod, a shaft, a link secured to said shaft. a pitman pivotally connected tosaid cross head, said pitman having a recess therein. adapted to accommodate the shaft, an operating arm, a pin extending through said arm. link and pitman and means to oscillate said arm, said arm bearing against the shaft at the beginning of the stroke, and means engaged by said arm to act as a fulcrum to swing the link over the horizontal position.

5. A pumping jack comprising a pair of upright columns hinged to the floor. a cross head reciprocally mounted in said columns and adapted to be secured to a polish rod, a shaft. :1 link secured to said shatt. a pitman pivotally connected to said cross head. said pitman having a recess therein. :ulapted to accommodate the shaft. an operating arm. a pin extending through said arm. link and pitman and m ans to oscillate said arm. said arm bearing against the shaft at the beginning of the stroke. a bar secured to the columns, said arm being adapted to engage the bar to act as a lever and move the link over horizontal position.

In testimony. whereof, I atlix my signaturc.

HUBERT J. SMITH. 

